I added TVP (Textured Vegetable Protein) as a meat substitute, and it worked wonders.
For veggies, I used Cauliflower, Potatoes, Peas, Beans, Tomatoes, Carrots, Mint, Cilantro, and Caramelized Onions.
For the Biryani Masala, I used Bay Leaf, Green Cardamom, Cinnamon, Black Pepper, Cloves, Star Anise, Cumin Seeds, Coriander Seeds, Fennel Seeds, Red Chilli Powder, Ginger, Garlic, Turmeric, Yogurt, Lime Juice, Cilantro, Mint, and Green Chillies.